Calculating-machine.



4 PATHNTED APR. 21, 1908. V. ODHNER. CALCULATING MACHINE.

APPLICATION FILED JUNE 5, 1907..

"vice for returning these numbered disks into "To all whom it may concern:

UNITED ST C sfA rENT oFmcE.

vALEN'TiN ODHNER, OF STQPETEBSBURG, RUSSIA.

CALCULATING-MACHINE.

' Be it known that I, VALENTIN ODHNER, manufacturer, a subject of the King of Sweden, residing at No. 4 Tarakanofiski Pen, at St. Petersburg, Russia, have invented certain new and useful Im rovements in Calculatin Machines; and I 0 hereby declare the fo llowing to be a full, clear, and exact descri tion of the invention, such as will enab e others skilled in the art to which it tains to make and use the same. 1

The resent invention relates to means in calcifiating machines for returning numbered disks into the zero position, being especially adapted for use with that type of machines covered by United States patents to Odhner numbered 209,416 and 514,725.

As is known in calculating machines the numberof times the handle is rotated is in dicated by numbered disks.

Now the present invention relates to a dethe zero position by rotating and displacing the axle which carries them.- This axle has hitherto been rotated directly, by awinged disk','for example, placed on the same, and

the winged disk had to be rotated twice thro h an angle of 180 every time. To atten to the machine in this manner is It is also uncertain, because the handle-may be turned too far and a numbered disk may thus be brought away from the zero kposition, particularlywhen operating quic An 'mp'ortant object of the present invention is to remove these defects.

Inorder that the invention may be clearly understood, reference is made to the accompanying drawing in which one embodiment is re resented by way of example, and in which:

igure 1 is a front elevation of a calculating machine with the new device; Fig. 2 is a vertical transverse section through the-same;

Fig. 3 shows the new device in elevation seen from the end, the cover'having been removed; Fig. 4 is a section on the lineA.-B of Fig. 3 on an enlarged scale, and Fig. 5 shows one form of a detail.

Similar letters of reference denote similar parts in all views.

The numbered disks a (Fig. 2) are provided in known manner with displaceable teeth I) which enga e'in the teeth of the counting wheels 6. Fhe latter engage in the teeth of Specification of Letters Patent.

Application and June a, 1901. Serial No. amass.

apper- Patented. April 21, 1908.

driving wheels f which are loose on a common axle d, and each of the wheels f carries laterally a numbered disk g. The rounded end of a lever is is pressed by a spring 3 between the teeth of the wheels f and holds these firmly in their stationary position at any time.

At the side of the machine there is a case C arranged in which the new device for setting the numbered disksg to zero is placed. A ring 0 which is fastened onthe frame of the machine is loose on the end of the axle d which projects out of the machine, and this ring 0 has a notch' or incision 1) which slopes upwardly. Opposite this rin a toothed wheel 2' provided with .9. lug or shoulder i is ar ranged fixed on the axle d-in such a manner that this shoulder lies against the ring 0 and engages in the incision 'u in the zero position.

Further, a spring ac is provided on the axle d between a collar 0: and the side of the frame of the machine, and this sprin as tends to the left against the ring 0. Each of the .disks 9 possesses a pin 1 against which a pin m can he when the axle d is displaced to the right one pin m being provided on the axle d for each disk. If the axle d is rotated by means of thetoothed Wheel 1'. the shoulder t press the axle d and with it the shoulder i to slides out ofthe incision a), the axle d is thereby displaced to the right, and conse uently the numbered disks become coupled in iown manner with the axle d by means of the pins m amd l and are rotated by the same, until the shoulder 4. falls into the incision 'v and the disks are disengaged from the axle d.

An axle n with a toothed wheel q is journaled in the case C; this wheel q engages with the toothed wheel 1'. and possesses, for examle, three times as many teeth as the latter. gvith the toothed wheel g there is rigidl connected a ratchet wheel 1", the number 0 teeth of which is a multiple of the ratio of transmission between the toothed wheels i and q, and has for example 15 teeth. Further a hub s'carrying 'a key-lever Z is loose on the axle n; this lever projects out of the case throu h a slot (Fig. 1) and carries a pin h. A pawl 1, is on the latter and is. pressed by a spring t into the teeth of the ratchet wheel 1. A spring t holds the lever Z in its'normal position. The movement of the ver Z is in the present case limited to 120,

hub of the le-.

\ is as follows :'*When the lever, Z is depressed the pawl it engages in the teeth of the ratchet wheel 7', whereby the latter and with itthe toothed wheel g is i'otated 1209. The latter transmits its rotation ,to the toothed wheel 71 5M. e. to make M and causes a complete revolution of the axle d in'consequence of the ratio oftransmission. At the commencement of the rotation the shoulder i of the the face of the incision v of the ring 0 which slopes up in a slanting direction-,' whereby the axle is displaced to the right. The numbered disks are rotated tion, whereu are coupled with the axle d and by the latter into their, zero posion "the projection '1', of the toothed whee t' falls into the notch 0 again and the axle d is therebydis placed to the left again. The numbered disks'can then be rotated independently of the axle d. When the lever Z returns to its normal position the toothed wheels andremain stationary and with them a so' the axle d;

As the same teeth'of the l5 teethwitli wheel 1- is-provided alwa s which the ratchet operate, and as the pawl h might possibly jump over one tooth and thus cause a mis-' take, it is preferable to provide the ratchet wheel r with only "three ratchet teeth h which are placed 120 :N, the ratio of the number of the teethiofthe ratchet ,wheel to unity equal to the ratio of transmission betweenand'i. Thus'each revoalways corresponds to ratchet wheel, so that it the toothed wheels lution of the axle only one tooth of the is not possible to make a mistake'when' set-' ting the disks to zero. What I claim as my invention secure by Letters Patent is: i I i I 1. In a calculating machine, the combination of numbered disks and an axle for re* turning said numbered disks into the zero position, with a rotary-pivot-shaft, a lever loosely mounted on said pivot-shaft, a spring for returning said lever,' a driving member on said-axle adapted to displace said axle longitudinally when the same is rotated, a gear wheel on said pivot adapted to drive said driving member, and ratchet mechanism connected with said lever adapted to drive said gear wheel when said lever is rotated forward, the ratio wheel and driving member" being the ratio of the angle through which said le-- of transmission of said gear equal to ver'. is rotated to one complete revolution, whereb'} when said said a. e is displaced and rotated onerevolution. i

. 2. In acalculating machine, the combination of numbered disks and an axle for .means adapted to e toothed wheel i slides on one from another (Fig.

opening into said case,

and desire to lever is rotated forwardcase 14 turning said numbered "disks into the zero po sition, with a pivot, a lever on said pivot,

caring connected with said pivot adapted to drive said axle, ratchet mechanism connect' ed with. said lever adapted to drive said gearing when said lever is rotated forward, and

mg the stroke of sai lever corresponding to the ratio of transmission of said gearin the ratio of transmission of said caring eing equal to the ratio of the angle t said lever isrotated to one complete revolution, whereb when said loveris rotated forward said a e is rotated one revolution.

In a calculat' mac "e, the combina tion of numbered disk'sand an axle for returning said numbered disks into the zero position, with'a case having an opening ahd a slot, the end of said axle passing through said 1 opening into said case, a ring having a notch in said case roundsaidaxle, a toothed wheel piovided with a lug normally'in'said notch. ed on said axle, 'a'plijvot in said case, a lever on sa d pivot exten g through said slot, a

toothed wheel carrying a ratchet wheel on said ivot gearing with said former toothed .whee and a spring-pressed ratchet on said lever-for driving said ratchet wheel when said lever is moved forward, the-ratio oftransmission Lofsaid toothedwheels being equal to the ratio of the angle thro'u h which said lever is rotated to 360, where y when said leveris rotated forward said axle is displaced and rotated one revolution as set forth.

4. In a calculating machine, the combination of numbered disks and an axle for returning said numbered disks into the zero position, with a case having an opening and a slot, the end of said axle passing through said a ring havinga notch in said case roundsaid axle a toothed wheel provided with a lug normally in said notch fixed onsaid axle, a ivot in said case, a lever on said pivot exten ing through said slot, a toothed wheel carrying a ratchet wheel on said ivot gearing withsaid former toothed whee and lever for driving sai ratchet wheel when said lever is movcdjorward, the ratio of transmission .01' said toothed wheels being equal to the ratio of, the an le through which said lever'is rotated to 360 and said slot limiting the stroke of said levercorresponding to the ratio of transmission of said toothed wheels, whereby when said lever is rotated forward said axle is displaced and rotated one revo liition as set forth.

5. Ina calculating machine, the combination of numbered disks and an axle for re-- turningsaid numbered disks iii'tothe zero position, with a pivot, a lever carried by said pivot, gearing connected with said pivot adapted to drive said axis, ratchet mechanism connected with said lever 'adapted to ough which a sprin '-pressed ratchet on said age said lever for liinit- I 

